The control logic of single elevator and the control method of multi-elevator cluster were studied based on DPRO elevator simulation training model, and the control algorithm of elevator cluster was optimized with the goal of minimizing the waiting time of passengers. The automatic control system of elevator cluster is designed by Siemens S7-1200 PLC, and the program of elevator cluster control system and the monitoring screen of upper computer are written by TIA Portal software. The automatic control and real-time monitoring of running state of six elevators cluster are realized. The simulation results show that the improved system can effectively reduce the average waiting time of passengers. And improve the overall working efficiency of the elevator group.